Genetic Variation and its Control

Why Organisms are different

Offspring resmeble their parents because they conain genetic information passed onto them by their parents.

Chromosomes and genes

Chromosomes, found in the cell necleus contain many genes.

A gene is a section of DNA, which carries coding for a particular protien.

Different genes control the development of different characterisitcs of an organism.

Many genes are needed to carry all the genetic information for a whole organism.

Number of genes and chromosomes varies from species to species. Humans have 46 choromoes that carry around 30,000 genes in each cell.

Genetic Factors

Although individuals of a species look similar, they are not usually idenitical these differences are calling variation.

Inherited Variation

Variation due to genetic causes is inherited variation...

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Why Organisms are different 2

...For example, children usually look a little like their father, and a little like their mother. But will not look identical to either of their parents. As they get half of their inherited factors from each parent.

Eye colour

Hair colour

Skin colour

Lobe/Lobeless ear

Enviromental Factors

Characteristics of animal and plant species can be affected by such factors...

Climate

Diet

Accidents

Culture

Lifestyle

E.g- Eat lots you will become heavier/Eat less skinnier, A plant in the shade will grow taller to get light